The numbing effect from the local anesthetic will last a few hours typically (depending on which drug used, maybe 4-8 hours). If we include steroid, the pain relief from reduced inflammation might start later that day or the next day and could last a few days to several weeks. Some purely diagnostic blocks use only anesthetic (so relief is just hours) – that’s to see if pain returns when it wears off, confirming the source. 

Therapeutic blocks often combine steroid for longer relief. Some nerve blocks (like in CRPS) repeated in series can extend relief more each time. But generally, for a single block, don’t expect more than a couple weeks from one injection, if steroid is used, and just hours if not. Each situation is different though.

We do our best to make it as comfortable as possible. You’ll feel a quick pinch from the numbing needle. Pressure sensations during the block are common. If we’re near a nerve, sometimes there’s a momentary zing or reproduction of your pain – that can actually be a sign we’re in the right spot, ironically. We warn patients of that possibility (“you might feel your usual pain shoot briefly – it means we’re touching the nerve causing it”). We will minimize any sharp pains. 

The procedure is usually over in just a few minutes, and most patients tolerate it quite well. Many blocks are no more uncomfortable than a typical shot or blood draw after the numbing is done.

Follow any specific instructions we give you. Generally, take it easy the day of. If your leg was numbed, you must be careful not to fall – don’t bear weight until sensation returns. You might use a sling if an arm is numbed to avoid letting it dangle. Keep the injection site clean and dry for a day. Watch for any concerning signs like swelling, redness (rare signs of infection) or if you had a sympathetic block watch for any unusual symptoms. But mostly, rest and enjoy the relief! 

We also advise you to not do something extreme just because you’re numb (like if your shoulder block took away pain, don’t go lift heavy stuff that evening because you could injure yourself without feeling it). Once sensation/pain returns, use that information: if it was diagnostic, note how much and how long relief you got. If therapeutic, continue any other treatments (e.g., physical therapy) as directed, hopefully now with less pain.

Yes, depending on the situation. For some conditions, a series of blocks is planned. We always weigh the benefits of repeat injections, especially with steroids (too many steroids can have systemic effects). But spaced out appropriately, multiple blocks can be fine. Some patients with chronic issues get them periodically for flare-ups. We might try a block in one area, then another if diagnosing. If a block gives only partial relief, a repeat might boost it. 

However, if you need very frequent blocks to manage pain, we might consider more definitive options like RFA or surgery. Each block usually must be at least a week or two apart if repeating, to allow assessment and avoid overlap of steroid dosing.

If a properly placed nerve block gives no relief, it suggests either that nerve isn’t the source of pain or something else is overriding the pain. We’d go back to the diagnostic drawing board. Sometimes it means the pain might be more central or from multiple sources. 

We might try a different block or different approach. It’s valuable information – a negative block can rule out a diagnosis. Of course, if it doesn’t help, we won’t keep doing the same block. We’ll discuss other tests or referrals. It’s all about narrowing down what will improve your pain.